code: def tearDownClass(cls):
      ray.shutdown()
  
file_path: ray/rllib/tests/test_nested_action_spaces.py
imports: from gymnasium.spaces import Box, Dict, Discrete, MultiDiscrete, Tuple
  import numpy
  import os
  import shutil
  import tree
  import unittest
  import ray
  from ray.rllib.algorithms.bc import BC
  from ray.rllib.algorithms.ppo import PPOConfig
  from ray.rllib.examples.env.random_env import RandomEnv
  from ray.rllib.offline.json_reader import JsonReader
  from ray.rllib.policy.sample_batch import convert_ma_batch_to_sample_batch
  from ray.rllib.utils.test_utils import framework_iterator
label_desc: Use image node_id 2 for calling the NestedActionSpacesTest obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types